fwidth — return the sum of the absolute derivatives in x and y
| ||genType p |
Specifies the expression of which to take the partial derivative.
Available only in the fragment shader,
fwidth returns the sum of the absolute derivatives in x and y using local differencing for the input argument
p. It is equivalent to
abs(dFdx(p)) + abs(dFdy(p)).
|OpenGL ES Shading Language Version|
Copyright © 2011-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.